These Phase Shifters are used for varying the electrical length of transmission lines. Each unit consists of a section of waveguide with a narrow slot milled in the broad wall. Through this slot, a thin rexolite vane is introduced into the waveguide by a precision micrometer. The drive mechanism is arranged to provide more than 180° of phase shift over 0.300” travel on the micrometer dial, depending on the waveguide size. Featuring no backlash, these units will produce accurate and reproducible settings. All units are un-calibrated. Variable Phase Shifters are available in sizes WR3 to WR42. This product is now available with a metric micrometer drive assembly.